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NFS: Split nfs_parse_mount_options()

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Split nfs_parse_mount_options() to move the prologue, list-splitting and
epilogue into one function and the per-option processing into another.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
David Howells 2019-12-10 07:31:07 -05:00 committed by Anna Schumaker
parent 5eb005caf5
commit f8ee01e3e2
2 changed files with 73 additions and 56 deletions
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126
fs/nfs/fs_context.c
View File

@ -496,36 +496,18 @@ static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
}
/*
* Error-check and convert a string of mount options from user space into
* a data structure. The whole mount string is processed; bad options are
* skipped as they are encountered. If there were no errors, return 1;
* otherwise return 0 (zero).
* Parse a single mount option in "key[=val]" form.
*/
int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
{
char *p, *string;
int rc, sloppy = 0, invalid_option = 0;
unsigned short protofamily = AF_UNSPEC;
unsigned short mountfamily = AF_UNSPEC;
char *string;
int rc;
if (!raw) {
dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
return 1;
}
dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
rc = security_sb_eat_lsm_opts(raw, &ctx->lsm_opts);
if (rc)
goto out_security_failure;
while ((p = strsep(&raw, ",")) != NULL) {
{
substring_t args[MAX_OPT_ARGS];
unsigned long option;
int token;
if (!*p)
continue;
dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
token = match_token(p, nfs_mount_option_tokens, args);
@ -734,7 +716,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
if (!rc) {
dfprintk(MOUNT, "NFS: unrecognized "
"security flavor\n");
return 0;
return -EINVAL;
}
break;
case Opt_proto:
@ -744,24 +726,24 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
token = match_token(string,
nfs_xprt_protocol_tokens, args);
protofamily = AF_INET;
ctx->protofamily = AF_INET;
switch (token) {
case Opt_xprt_udp6:
protofamily = AF_INET6;
ctx->protofamily = AF_INET6;
/* fall through */
case Opt_xprt_udp:
ctx->flags &= ~NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp6:
protofamily = AF_INET6;
ctx->protofamily = AF_INET6;
/* fall through */
case Opt_xprt_tcp:
ctx->flags |= NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
break;
case Opt_xprt_rdma6:
protofamily = AF_INET6;
ctx->protofamily = AF_INET6;
/* fall through */
case Opt_xprt_rdma:
/* vector side protocols to TCP */
@ -773,7 +755,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
dfprintk(MOUNT, "NFS: unrecognized "
"transport protocol\n");
kfree(string);
return 0;
return -EINVAL;
}
kfree(string);
break;
@ -785,16 +767,16 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
nfs_xprt_protocol_tokens, args);
kfree(string);
mountfamily = AF_INET;
ctx->mountfamily = AF_INET;
switch (token) {
case Opt_xprt_udp6:
mountfamily = AF_INET6;
ctx->mountfamily = AF_INET6;
/* fall through */
case Opt_xprt_udp:
ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp6:
mountfamily = AF_INET6;
ctx->mountfamily = AF_INET6;
/* fall through */
case Opt_xprt_tcp:
ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
@ -803,7 +785,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
default:
dfprintk(MOUNT, "NFS: unrecognized "
"transport protocol\n");
return 0;
return -EINVAL;
}
break;
case Opt_addr:
@ -867,7 +849,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
default:
dfprintk(MOUNT, "NFS: invalid "
"lookupcache argument\n");
return 0;
return -EINVAL;
}
break;
case Opt_fscache_uniq:
@ -900,7 +882,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
default:
dfprintk(MOUNT, "NFS: invalid "
"local_lock argument\n");
return 0;
return -EINVAL;
}
break;
@ -908,7 +890,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
* Special options
*/
case Opt_sloppy:
sloppy = 1;
ctx->sloppy = 1;
dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
break;
case Opt_userspace:
@ -918,12 +900,53 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
break;
default:
invalid_option = 1;
dfprintk(MOUNT, "NFS: unrecognized mount option "
"'%s'\n", p);
return -EINVAL;
}
}
return 0;
out_invalid_address:
printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
return -EINVAL;
out_invalid_value:
printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
return -EINVAL;
out_nomem:
printk(KERN_INFO "NFS: not enough memory to parse option\n");
return -ENOMEM;
}
/*
* Error-check and convert a string of mount options from user space into
* a data structure. The whole mount string is processed; bad options are
* skipped as they are encountered. If there were no errors, return 1;
* otherwise return 0 (zero).
*/
int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
{
char *p;
int rc, sloppy = 0, invalid_option = 0;
if (!raw) {
dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
return 1;
}
dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
rc = security_sb_eat_lsm_opts(raw, &ctx->lsm_opts);
if (rc)
goto out_security_failure;
while ((p = strsep(&raw, ",")) != NULL) {
if (!*p)
continue;
if (nfs_fs_context_parse_option(ctx, p) < 0)
invalid_option = true;
}
if (!sloppy && invalid_option)
return 0;
@ -938,22 +961,26 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
* verify that any proto=/mountproto= options match the address
* families in the addr=/mountaddr= options.
*/
if (protofamily != AF_UNSPEC &&
protofamily != ctx->nfs_server.address.ss_family)
if (ctx->protofamily != AF_UNSPEC &&
ctx->protofamily != ctx->nfs_server.address.ss_family)
goto out_proto_mismatch;
if (mountfamily != AF_UNSPEC) {
if (ctx->mountfamily != AF_UNSPEC) {
if (ctx->mount_server.addrlen) {
if (mountfamily != ctx->mount_server.address.ss_family)
if (ctx->mountfamily != ctx->mount_server.address.ss_family)
goto out_mountproto_mismatch;
} else {
if (mountfamily != ctx->nfs_server.address.ss_family)
if (ctx->mountfamily != ctx->nfs_server.address.ss_family)
goto out_mountproto_mismatch;
}
}
return 1;
out_minorversion_mismatch:
printk(KERN_INFO "NFS: mount option vers=%u does not support "
"minorversion=%u\n", ctx->version, ctx->minorversion);
return 0;
out_mountproto_mismatch:
printk(KERN_INFO "NFS: mount server address does not match mountproto= "
"option\n");
@ -961,23 +988,10 @@ out_mountproto_mismatch:
out_proto_mismatch:
printk(KERN_INFO "NFS: server address does not match proto= option\n");
return 0;
out_invalid_address:
printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
return 0;
out_invalid_value:
printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
return 0;
out_minorversion_mismatch:
printk(KERN_INFO "NFS: mount option vers=%u does not support "
"minorversion=%u\n", ctx->version, ctx->minorversion);
return 0;
out_migration_misuse:
printk(KERN_INFO
"NFS: 'migration' not supported for this NFS version\n");
return 0;
out_nomem:
printk(KERN_INFO "NFS: not enough memory to parse option\n");
return 0;
return -EINVAL;
out_security_failure:
printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
return 0;

3
fs/nfs/internal.h
View File

@ -96,7 +96,10 @@ struct nfs_fs_context {
unsigned int version;
unsigned int minorversion;
char *fscache_uniq;
unsigned short protofamily;
unsigned short mountfamily;
bool need_mount;
bool sloppy;
struct {
struct sockaddr_storage address;